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 * Copyright 2014 Edgar Espina
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
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 * Apache (Software) License, version 2.0 ("the License").
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 * specific rights regarding derivate works.
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 * specific rights regarding derivate works.
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 * as this file.
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 * Apache (Software) License, version 2.0 ("the License").
 * See the License for details about distribution rights, and the
 * specific rights regarding derivate works.
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 *
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 *
 * A copy is also included in the downloadable source code package
 * containing Woodstox, in file "ASL2.0", under the same directory
 * as this file.
 */
/**
 * This copy of Woodstox XML processor is licensed under the
 * Apache (Software) License, version 2.0 ("the License").
 * See the License for details about distribution rights, and the
 * specific rights regarding derivate works.
 *
 * You may obtain a copy of the License at:
 *
 * http://www.apache.org/licenses/
 *
 * A copy is also included in the downloadable source code package
 * containing Woodstox, in file "ASL2.0", under the same directory
 * as this file.
 */
package org.jooby.run;

import com.google.common.io.Files;
import com.typesafe.config.Config;
import com.typesafe.config.ConfigFactory;
import me.tongfei.progressbar.ProgressBar;
import org.gradle.api.internal.ConventionTask;
import org.gradle.api.logging.Logger;
import org.gradle.api.tasks.InputDirectory;
import org.gradle.api.tasks.OutputDirectory;
import org.gradle.api.tasks.OutputFile;
import org.gradle.api.tasks.TaskAction;
import org.jooby.assets.AssetCompiler;
import org.jooby.funzy.Try;

import java.io.File;
import java.io.FileWriter;
import java.lang.reflect.InvocationTargetException;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicReference;
import java.util.stream.Collectors;

public class AssetTask extends ConventionTask {

  @SuppressWarnings("serial")
  private static class CompilationDone extends RuntimeException {
  }

  private String env;

  private String mainClassName;

  @InputDirectory
  private File output;

  @OutputDirectory
  private File assemblyOutput;

  private String maxAge;

  @OutputFile
  private File assetFile;

  @TaskAction
  public void process() throws Throwable {
    try {
      // Hack and bind jooby env.
      String env = getEnv();
      this.assetFile = new File(getOutput(), "assets." + env + ".conf");
      new JoobyContainer(getProject())
          .run(getMainClassName(), (app, conf) -> compile(getLogger(), app.getClass().getClassLoader(), env, getMaxAge(), getOutput(),
              assetFile, getAssemblyOutput(), conf), env);
    } catch (CompilationDone ex) {
      // done
    }
  }

  private static void compile(final Logger logger, final ClassLoader loader,
      final String env, final String maxAge, final File output, final File distFile,
      final File assemblyOutput, Config conf) {
    Try.run(() -> {
      output.mkdirs();

      logger.debug("claspath: " + loader);

      Config assetConf = ConfigFactory.parseResources(loader, "assets.conf")
          .withFallback(conf);

      logger.debug("assets.conf: " + assetConf.getConfig("assets"));

      AssetCompiler compiler = new AssetCompiler(loader, assetConf);

      AtomicReference<ProgressBar> pb = new AtomicReference<>();
      compiler.setProgressBar((progress, total) -> {
        if (pb.get() == null) {
          pb.set(new ProgressBar("Compiling assets", total).start().stepTo(progress));
        } else {
          pb.get().step();
        }
      });
      long start = System.currentTimeMillis();
      Map<String, List<File>> fileset = compiler.build(env, output);
      pb.get().stop();

      StringBuilder dist = new StringBuilder();
      dist.append("assets.fileset {\n").append(fileset.entrySet().stream().map(e -> {
        String files = e.getValue().stream()
            .map(file -> output.toPath().relativize(file.toPath()))
            .map(path -> "/" + path.toString().replace("\\", "/"))
            .collect(Collectors.joining("\", \"", "[\"", "\"]"));
        return "  " + e.getKey() + ": " + files;
      }).collect(Collectors.joining("\n")))
          .append("\n}\n");
      dist.append("assets.cache.maxAge = ").append(maxAge).append("\n");
      dist.append("assets.watch = false\n");
      dist.append("assets.pipeline.dev = {}\n");
      dist.append("assets.pipeline.").append(env).append(" = {}\n");
      try (FileWriter writer = new FileWriter(distFile)) {
        writer.write(dist.toString());
      }
      long end = System.currentTimeMillis();
      CharSequence summary = compiler
          .summary(fileset, output.toPath(), env, end - start, "        " + assemblyOutput, "Assets: " + distFile);
      logger.info(summary.toString());

      // move output to fixed location required by zip/war dist
      List<File> files = fileset.values().stream()
          .flatMap(Collection::stream)
          .collect(Collectors.toList());

      for (File from : files) {
        File to = assemblyOutput.toPath().resolve(output.toPath().relativize(from.toPath()))
            .toFile();
        to.getParentFile().mkdirs();
        logger.debug("copying file to: " + to);
        Files.copy(from, to);
      }
    }).unwrap(InvocationTargetException.class)
        .throwException();
  }

  public String getEnv() {
    return env;
  }

  public void setEnv(final String env) {
    this.env = env;
  }

  public String getMainClassName() {
    return mainClassName;
  }

  public void setMainClassName(final String mainClassName) {
    this.mainClassName = mainClassName;
  }

  public File getOutput() {
    return output;
  }

  public void setOutput(final File output) {
    this.output = output;
  }

  public File getAssemblyOutput() {
    return assemblyOutput;
  }

  public void setAssemblyOutput(final File assemblyOutput) {
    this.assemblyOutput = assemblyOutput;
  }

  public String getMaxAge() {
    return maxAge;
  }

  public void setMaxAge(final String maxAge) {
    this.maxAge = maxAge;
  }

}
